[DWARFLinker] Only extract unit DIEs when cloning clang modules (#69495) #7643
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Reduce memory usage by only extract unit DIEs when cloning clang
modules. We don't need the full debug info yet at this stage. This
reduces peak memory usage of dsymutil when linking the swift driver by
multiple gigabytes.
rdar://117156180
(cherry picked from commit 077d89f)